Earlier quoted context omitted.
I have thought about this as well, and with that in mind, I've tried to take notice of how typing affects me (I'm a pretty fast typist, but I think this experience is not dependent on any particular typing speed). What seems to be the main problem is that typing dominates my internal monologue. I can't continue to keep my ideas fresh in my mental "cache" while I'm typing, because the part of my mind that would be use…
That might be part of the issue. My typing isn't particularly fast, but it is mindless. I spend virtually no mental effort on typing while I'm actually doing it, so I'm free to think about exactly what I'm trying to do and what the best way to do it is.
Hypothesis test (I'll tell you the hypothesis after you answer): What is the experience of thinking like for you?